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並前往https://www.freecodecamp.org/news/a-simple-explanation-of-pull-down-and-pull-up-resistors-660b308f116a/

Hardware fundamentals: how pull-down and pull-up resistors ...

On the Arduino, this is called General Purpose Input Output (GPIO). So, we can do something like this: Diagram 2. We connect positive (5v, 3.3V, ...

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